Note
QST, Aug 1958, p. 129.
QST, Mar 1960, p. 148.
QST, Apr 1964, p. 139.
Eico short form catalog 1965, p. 43.
Eico catalog 1968
Eico catalog 1969
Eico catalog 1972, p. 15.
Kit or wired
The EICO Model 710 Grid Dip Meter is a tube‑type grid‑dip oscillator. Covering a frequency range from approximately 400 kHz to 250 MHz via eight plug‑in coils, it uses a Colpitts oscillator circuit based on a 6 AF4A tube.
With the selected coil loosely coupled to a tuned circuit, the meter in the grid circuit will show a “dip” at resonance, allowing the user to determine the circuit’s resonant frequency, Q, or infer component values.
Additional functions include serving as a wavemeter, signal‑generator, and zero‑beat detector via a switchable diode and headphone function.
Discontinued late in 1972 or early 1973.
Frequency Range: 400 kHz to 250 MHz in 8 overlapping ranges
Meter Movement: 500 µA
Coils: Pre-wound and calibrated to 0.05%
Tuning : planetary drive with 1:7 drive ratio
Dial: 340º rotation, illuminated, scales are 3 3/4" long.
Power supply" selenium recifiier
Power: 117 VAC, 50/60 Hz
Tube: (1) 6AF4 or 6T4
References
EICO catalog, copyright 1958
Brief description. Radio News, Feb 1959, p. 140.
Brief description. Popular Electronics, Apr 1959, p. 28.
